Question

我有一个倒数计时器，我想在终结法或某种代码上实现，这样当计时器停止时，文本视图会变为时间 和启动另一种方法（在活动中）。为了澄清，计时器被赋予一个从xx:xx格式向下倒数的起始编号。

计时器的类：

public class countdown_timer {
private  long pls;
private long millisInFuture;
private long countDownInterval;
private boolean status;
public countdown_timer(long pMillisInFuture, long pCountDownInterval) {
    this.millisInFuture = pMillisInFuture;
    this.countDownInterval = pCountDownInterval;
    this.pls = pMillisInFuture;

    status = false;
    Initialize();
}

public void Stop() {
    status = false;
}
public  void Reset() {
    millisInFuture = pls;
}

public long getCurrentTime() {
    return millisInFuture;
}

public void Start() {
    status = true;
}
public void Initialize()
{
    final Handler handler = new Handler();
    Log.v("status", "starting");
    final Runnable counter = new Runnable(){

        public void run(){
            long sec = millisInFuture/1000;
            if(status) {
                if(millisInFuture <= 0) {
                    Log.v("status", "done");
                } else {
                    Log.v("status", Long.toString(sec) + " seconds remain");
                    millisInFuture -= countDownInterval;
                    handler.postDelayed(this, countDownInterval);
                }
            } else {
                Log.v("status", Long.toString(sec) + " seconds remain and timer has stopped!");
                handler.postDelayed(this, countDownInterval);
            }
        }
    };

    handler.postDelayed(counter, countDownInterval);
}

使用计时器的活动：

 @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_card_game_2);
    //...find views
    mycounterup = new countdown_timer(startcard, 1000);
    mycounterdown = new countdown_timer(startcard, 1000);
    RefreshTimer();
    mycounterdown.Start();

  public void RefreshTimer()
{
    final Handler handler = new Handler();
    final Runnable counter = new Runnable(){

        public void run(){
            int minutes_up_start = (int) (mycounterup.getCurrentTime() / 1000) / 60;
            int seconds_up_start = (int) (mycounterup.getCurrentTime() / 1000) % 60;
            String time_2_up_start_formatted = String.format(Locale.getDefault(), "%02d:%02d", minutes_up_start, seconds_up_start);
            card_2_up.setText(time_2_up_start_formatted);

            int minutes_down_start = (int) (mycounterdown.getCurrentTime() / 1000) / 60;
            int seconds_down_start = (int) (mycounterdown.getCurrentTime() / 1000) % 60;
            String card_2_down_start_formatted = String.format(Locale.getDefault(), "%02d:%02d", minutes_down_start, seconds_down_start);
            card_2_down.setText(card_2_down_start_formatted);
            handler.postDelayed(this, 100);
        }
    };

    handler.postDelayed(counter, 100);
}

Answer 1

您可以使用CountDownTimer：

new CountDownTimer(endsIn * 1000, 1000) { 
public void onTick(long millisUntilFinished) { 
           timerTextView.setText(String.valueOf(millisUntilFinished/1000);
 } 
public void onFinish() {
} 
}.start();

或

扩展CountDownTimer类：

public class countdown_timer extends CountDownTimer { TextView textView; @Override public void onTick(long millisInFuture) { long sec = millisInFuture/1000; if(millisInFuture <= 0) { Log.v("status", "done"); } else { Log.v("status", Long.toString(sec) + " seconds remain and timer has stopped!"); } } @Override public void onFinish() { if(textView != null){ // change text in your textview } } public countdown_timer(long pMillisInFuture, long pCountDownInterval) { super(pMillisInFuture, pCountDownInterval); } public countdown_timer(TextView textView, long pMillisInFuture, long pCountDownInterval) { super(pMillisInFuture, pCountDownInterval); this.textView = textView; } }

这里有两个构造函数，其中一个与您的示例中的构造函数相同，在第二个构造函数中，您也可以传递TextView对象并在onFinish()方法中使用它。

更新2：

以下是活动中的CountDownTimer：

public class MainActivity extends AppCompatActivity { TextView textView; CountDownTimer mycounterdown; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); long startcard = 10000; textView = (TextView) findViewById(R.id.test); mycounterdown = new CountDownTimer(startcard, 1000) { @Override public void onTick(long mycounterup) { int minutes_up_start = (int) (mycounterup / 1000) / 60; int seconds_up_start = (int) (mycounterup / 1000) % 60; String time_2_up_start_formatted = String.format(Locale.getDefault(), "%02d:%02d", minutes_up_start, seconds_up_start); textView.setText(time_2_up_start_formatted); } @Override public void onFinish() { // call here other methods from activity testMethod(); } }; mycounterdown.start(); } public void testMethod(){ Toast.makeText(MainActivity.this, "Test Method called", Toast.LENGTH_SHORT).show(); } }

更新3：如果最后一个刻度为1，则不会将零更改倒计时间隔设置为500而不是1000：

public class MainActivity extends AppCompatActivity { TextView textView; CountDownTimer mycounterdown; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); long startcard = 10000; textView = (TextView) findViewById(R.id.test); mycounterdown = new CountDownTimer(startcard, 500) { @Override public void onTick(long mycounterup) { int minutes_up_start = (int) (mycounterup / 1000) / 60; int seconds_up_start = (int) (mycounterup / 1000) % 60; String time_2_up_start_formatted = String.format(Locale.getDefault(), "%02d:%02d", minutes_up_start, seconds_up_start); textView.setText(time_2_up_start_formatted); } @Override public void onFinish() { // call here other methods from activity testMethod(); } }; mycounterdown.start(); } public void testMethod(){ Toast.makeText(MainActivity.this, "Test Method called", Toast.LENGTH_SHORT).show(); } }

注意：请查看此answer

Answer 2

首先，在您的计时器类中扩展CountDownTimer。

public class countdown_timer extends CountDownTimer {

}

这允许您实现一些方法。

@Override
public void onTick(long l) {

}

@Override
public void onFinish() {

}

此外，您必须实现与超类匹配的构造函数。您还可以添加一些其他参数。例如TextView

TextView textView;
public countdown_timer(long millisInFuture, long countDownInterval, TextView txt) {
    super(millisInFuture, countDownInterval);
    textView = txt;
}

onFinish()就是你想要的。另外，请确保将此类用作CountDownTimer。然后你就可以开始计时了。希望它有所帮助。

倒计时器如何实现onfinish方法

2 个答案: